Its strong until the shaft literally shatters and destroys the engine. You are literally asking for it with those boost levels. Atleast upgrade to a KO4/hybrid with k16 comp wheel/turbine , to get same boost & better perfomance/flow with lower shaft speed.
Yeah, I'm aware of that. In one or two weeks, I'll start disassembling my car to finish the project. K03 was never in my project, its just that here is Brazil things are so expensive, and in this time I was doing another thins to the car.
Soon I'll be with 400whp, with a proper turbo, etc... if you have instagram, see my project at @a3stroker.